JP4950975B2 - Intake device for multi-cylinder internal combustion engine - Google Patents

Description

  The present invention relates to an intake device for a multi-cylinder internal combustion engine provided with an intake manifold chamber for guiding intake air to a plurality of cylinders and a plurality of intake branch passages branched from the intake manifold chamber. The present invention relates to an intake device provided with a resonator chamber that communicates with.

In an intake device of an internal combustion engine, a resonator that uses resonance based on the pulsation pressure of intake air is intended to increase volumetric efficiency near a specific engine rotation speed to increase engine torque, or to reduce intake noise near a specific frequency. Provided for reduction.
As such a resonator, an intake air collecting chamber having an intake air introduction passage through which intake air flows, and a plurality of intake branch passages that respectively connect the combustion space formed in each of the plurality of cylinders and the intake air collecting chamber are provided. In an intake device of a multi-cylinder internal combustion engine, a resonator chamber in which a resonator chamber communicates with an intake manifold through a communication path is known. (For example, see Patent Document 1)
In addition, an intake device for an internal combustion engine is also known in which a plurality of communication passages are provided for communicating a resonator chamber and an intake passage, and an open / close valve is provided in the communication passage. (For example, see Patent Document 2)
Japanese Patent Laid-Open No. 11-82203 JP 59-215913 A

The inlets of a plurality of intake branch passages that open to the intake air collection chamber of the intake device are arranged side by side in the arrangement direction, and when the intake air flowing in from the intake air introduction passage flows in the arrangement direction in the intake air collection chamber, the intake air lines are arranged in the arrangement direction. However, among all the inlets, the inlet far from the intake intake passage is wider than the intake branch passage close to the intake introduction passage until the intake air reaches the inlet of the intake branch passage. Due to the diffusion, the flow rate of the intake air flowing into the intake branch passage (hereinafter referred to as “intake amount”) tends to decrease. The variation in the intake air amount between the plurality of intake branch passages caused by this may cause variations in the combustion state in the plurality of cylinders, leading to a decrease in exhaust emission performance and an increase in torque fluctuation.
Further, since the resonator chamber of the resonator has a relatively large volume, when the resonator chamber is disposed with a partition wall sandwiched between the intake manifold chamber, in order to prevent the intake device from becoming large, the intake manifold chamber It is desirable to arrange it compactly.
Further, the communication path that connects the resonator chamber and the intake air collecting chamber is referred to as an operation region (hereinafter referred to as “resonance operation region”) other than an operation region where resonance by the resonator occurs (hereinafter referred to as “resonance operation region”). ), The flow of intake air in the intake air collection chamber is disturbed, and particularly when an on / off valve is provided to open and close the communication passage, the on / off valve protrudes into the intake air collection chamber, thereby reducing the flow of intake air. Disturbances become even greater.

The present invention has been made in view of such circumstances, and the invention according to claims 1 to 3 is an intake device of a multi-cylinder internal combustion engine, in which the amount of intake air flowing into the intake branch passage from the intake manifold is equal. An object of the present invention is to reduce the size of an intake device provided with a resonator chamber disposed adjacent to the intake manifold.

According to the first aspect of the present invention, the intake air collecting chamber having an intake air introduction passage through which intake air flows, and the predetermined number of combustion spaces formed in a plurality of predetermined number of cylinders communicate with the intake air collecting chamber, respectively. In the intake system of a multi-cylinder internal combustion engine provided with the predetermined number of intake branch passages and a resonator chamber communicating with the intake manifold chamber through the communication passage, each of the intake branch passages opens into the intake manifold chamber. Each inlet is formed by an upstream end passage wall of a passage wall forming each intake branch passage, and the predetermined number of the inlets are arranged side by side in the arrangement direction, The collecting chamber wall to be formed has a first end wall and a second end wall facing each other in the arrangement direction, and a first side wall and a second side wall facing each other in a first direction on an orthogonal plane orthogonal to the arrangement direction. And the first The wall forms the intake air introduction passage, and the upstream end passage wall is disposed on the first side wall, and the main flow of the intake air flowing from the intake air introduction passage is the first end wall in the intake air collecting chamber. The second side wall has an inclined wall between the first end wall and the second end wall in the arrangement direction, and the inclined wall Is inclined in the direction of approaching the inlet facing the inclined wall in the first direction as it goes from the first end wall to the second end wall in the arrangement direction. constitutes a chamber wall of the resonator chamber in one direction, the communicating passage is disposed on the inclined wall, wherein the communication passage on-off valve is provided for opening and closing the communication passage, the opening and closing valve, times A butterfly valve that pivots about a dynamic center line, as seen from the first direction. The pivot axis is an intake system for a multi-cylinder internal combustion engine, characterized in that it is substantially parallel to the array direction.
According to a second aspect of the invention, the intake system for a multi-cylinder internal combustion engine according to claim 1, when the direction perpendicular to the first direction on the orthogonal plane and the vertical direction, the collecting chamber wall, the first A bottom wall and a ceiling wall facing each other in the vertical direction between the first side wall and the second side wall in one direction, and the resonator chamber passes through a communication path different from the communication path. The other communication passage is arranged on the bottom wall.
According to a third aspect of the present invention, in the intake device for a multi-cylinder internal combustion engine according to the second aspect , the resonator chamber includes a first chamber positioned directly below the intake manifold chamber with the bottom wall interposed in the vertical direction. And a second chamber located directly beside the intake air collecting chamber across the inclined wall in the first direction.

According to the first aspect of the present invention, the intake air flowing from the intake air introduction passage and flowing in the arrangement direction from the first end wall toward the second end wall in the intake air collecting chamber is prevented from diffusing by the inclined wall. In addition, since the velocity component is deflected so as to generate a velocity component toward the inlet in the first direction, the amount of intake air flowing from the intake manifold to the intake branch passage far from the intake introduction passage in the arrangement direction increases. The intake air amount among the predetermined number of intake branch passages is equalized. As a result, variation in the combustion state between combustion spaces formed by a predetermined number of cylinders is reduced, exhaust emission performance is improved, and torque fluctuation is reduced.
Further, by forming the resonator chamber in which the inclined wall forms the resonator chamber, the inclined wall is inclined so as to approach the inlet of the intake branch passage in the first direction. Since the resonator chamber can be arranged by using the created space, the intake device provided with the resonator chamber arranged adjacent to the intake manifold with the inclined wall interposed therebetween can be downsized.
Furthermore, as the communication path that connects the intake air collecting chamber and the resonator chamber, the communication path provided with the on-off valve is arranged on the inclined wall, so that the on-off valve is open and resonance is generated by the communication path. In the operation region other than the region (that is, the non-resonant operation region), the communication path can be closed by the on-off valve. For this reason, compared to the communication passage that is always in communication, the occurrence of disturbance in the flow of intake air flowing along the inclined wall is suppressed, and the intake air amount is uniform between the predetermined number of intake branch passages by the inclined wall. The operating area where the conversion is performed is expanded.
Further, when the on- off valve is in the open state, the valve body of the on-off valve configured by the butterfly valve is substantially parallel to the flow direction of the intake air, so that the intake air flow caused by the on-off valve in the open state is reduced . The occurrence of turbulence is suppressed, and the decrease in the intake air equalization effect between the predetermined number of intake branch passages due to the inclined wall is suppressed.
According to the second aspect of the invention , in addition to the communication path provided with the on-off valve, there is provided another communication path that always connects the intake manifold path and the resonator chamber, so that the resonance operation region in which resonance by the resonator occurs. Is enlarged. Further, since the other communication passage is disposed on the bottom wall of the collecting chamber wall forming the intake collecting chamber, the flow of the intake air flowing along the inclined wall is disturbed by the another communication passage. And the equalization of the intake air amount among the predetermined number of intake branch passages by the inclined wall is maintained.
According to the third aspect of the present invention , the first chamber of the resonator chamber is located directly below the bottom wall where another communication passage that always connects the intake manifold passage and the resonator chamber is disposed. The passage facilitates the communication between the intake manifold passage and the resonator chamber. As a result, the degree of freedom in setting the path length and the area of the other communication path is increased, and the degree of freedom in setting the resonance operation region is increased.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
1 to 3, an intake device 10 to which the present invention is applied is provided in a multi-cylinder internal combustion engine E mounted on a vehicle. An internal combustion engine E, which is a spark ignition type four-stroke internal combustion engine, includes a predetermined number of cylinders C, a cylinder block 1 having four cylinders C in this embodiment, and a cylinder head 2 coupled to the cylinder block 1. The intake device 10 is connected to the cylinder head 2. A piston is fitted in each cylinder C so as to be able to reciprocate, and each piston is connected to a crankshaft rotatably supported by the engine body via a connecting rod.

  Each cylinder C and cylinder head 2 is an intake air and fuel supply means guided through an intake passage (hereinafter simply referred to as “intake passage”) formed by the intake device 10 between the cylinder head 2 and the piston. A combustion space 3 is formed in which an air-fuel mixture formed by mixing with fuel supplied by a certain fuel injection valve burns. Combustion gas generated in each combustion space 3 is driven by the piston, and then becomes exhaust gas through an exhaust port of an exhaust device connected to the cylinder head 2 through an exhaust port 5 formed in the cylinder head 2 as an exhaust gas. E is discharged to the outside. The piston driven by the combustion gas and reciprocatingly drives the crankshaft.

In an intake device 10 that takes in outside air as intake air, an air cleaner 11 that forms an air cleaner chamber 11a in which a filtering member that cleans the intake air is arranged, and a throttle valve 12b that controls the flow rate of the intake air from the air cleaner 11 are arranged. The throttle body 12 that forms the throttle passage 12a, and the intake manifold 13 that is connected to the throttle body 12 at the upstream end portion 13a and connected to the cylinder head 2 at the flange portion 13b that is the downstream end portion.
The upstream and downstream are related to the flow of intake air unless otherwise specified.

  Referring also to FIG. 4, the intake manifold 13 made of aluminum alloy includes an intake air collecting portion 20 that forms an intake air collecting chamber 30 into which intake air from the air cleaner 11 flows through the throttle body 12, the intake air collecting chamber 30, The four intake branch passages 50 as the predetermined number are formed to communicate with the four combustion spaces 3 as the predetermined number formed in the predetermined number of cylinders C through the intake ports 4 formed in the cylinder head 2. And a resonator chamber 62 provided with communication passages 71 and 72 for communicating the resonator chamber 62 and the intake manifold 30 with each other. The resonator chamber 62 communicates with the intake manifold 30 through the communication passages 71 and 72.

  Therefore, in the intake device 10, the intake air flows from the air cleaner chamber 11a through the throttle passage 12a and is guided to the intake manifold 30 and from the intake manifold 30 through each intake branch passage 50 to the combustion space of each cylinder C. 3 is inhaled. Therefore, the intake passage is constituted by the air cleaner chamber 11a, the throttle passage 12a, the intake manifold 30 and the four intake branch passages 50.

Referring to FIGS. 3 to 5, the intake air collecting section 20 has a collecting chamber wall 21 (see also FIGS. 1 and 2) that forms an intake collecting chamber 30. An intake air collecting chamber 30 that is a space elongated in the longitudinal direction A3, which is also an arrangement direction A0, which will be described later, includes an intake air introduction passage 31 into which intake air from the air cleaner 11 flows in the intake air collection chamber 30, and intake air that has passed through the intake air introduction passage 31 And an expansion chamber 32 in which each intake branch passage 50 opens. The arrangement direction A0 and the longitudinal direction A3 substantially coincide with the flow direction of the main flow of intake air in the intake air introduction passage 31 of the intake air collecting chamber 30 or the direction in which the intake air introduction passage 31 extends.
The expansion chamber 32 is a space that is long and narrow in the arrangement direction A0, and most of the expansion chambers 32 are cut off at an orthogonal plane P orthogonal to the arrangement direction A0 (an example of the orthogonal plane P is shown in FIG. 3). The area is larger than the passage area of the intake intake passage 31 and the passage area of each intake branch passage 50.
The intake air introduction passage 31 connected to the expansion chamber 32 in the arrangement direction A0 guides the intake air from the air cleaner 11 to the expansion chamber 32 in the arrangement direction A0.

Referring to FIGS. 1 to 5, the assembly chamber wall 21 includes a first end wall 22 and a second end wall 23 that face each other in the arrangement direction A0, and a first direction A1 on the orthogonal plane P that faces each other. A first side wall 24 and a second side wall 25, and a bottom wall 26 as a first wall facing each other in the vertical direction A2 when the second direction orthogonal to the first direction A1 on the orthogonal plane P is the vertical direction A2. And a ceiling wall 27 as a second wall.
A part of the first end wall 22 is a tubular intake introduction wall 22 a that forms the intake introduction passage 31. The expansion chamber 32 is formed by the first end wall 22, the first and second side walls 24 and 25, the bottom wall 26 and the ceiling wall 27 other than the intake introduction wall 22a.
The main flow of the intake air flowing in from the intake introduction passage 31 flows in the arrangement direction A 0 from the first end wall 22 toward the second end wall 23 in the intake air collecting chamber 30.

  In this embodiment, as shown in FIGS. 2, 4, and 5, the vertical direction A2 substantially coincides with the vertical direction, and the arrangement direction A0 substantially coincides with the horizontal direction. However, the vertical direction A2 is not limited to the substantially vertical direction.

  Referring to FIGS. 1 and 3 to 5, the intake branch section 40 includes four branch pipes 41. Each branch pipe 41 connected to the first side wall 24 at the upstream side and connected to the flange portion 13b at the downstream end portion and integrated with the flange portion 13b forms each intake branch passage 50. The pipe wall of each branch pipe 41 is a passage wall 42 of the intake branch passage 50 through which the intake air from the intake manifold 30 flows. Each passage wall 42 is formed by joining a tubular upstream pipe wall 43 and a tubular downstream pipe wall 44, which is a separate member from the upstream pipe wall 43. The downstream side pipe wall 44 is integrally formed with the first side wall 24 and connected to the first side wall 24.

  Each upstream side pipe wall 43 as an upstream end passage wall forming the upstream end passage 53 having the inlet 50i of each intake branch passage 50 is disposed on the first side wall 24 and in the first direction A1 in the intake air collecting chamber 30. And protrudes from the first side wall 24 toward the second side wall 25 (see FIG. 4). In this embodiment, each upstream side pipe wall 43 protrudes toward the second side wall 25 in the first direction A1 while being inclined upward, but as another example, is substantially parallel to the first direction A1. May protrude.

All the inlets 50i are arranged side by side in the arrangement direction A0 and open to the expansion chamber 32. All the upstream side pipe walls 43 and all the upstream end passages 53 are arranged side by side in the arrangement direction A0 in the expansion chamber 32, and are arranged so as to substantially overlap each other as viewed from the arrangement direction A0. The The arrangement direction A0 is a predetermined direction set in advance according to the arrangement of the intake branch passages 50 and the arrangement of the cylinders C.
Further, the predetermined number of branch pipes 41 and intake branch passages 50 are arranged side by side in the arrangement direction A0. In this embodiment, the arrangement direction A0 coincides with the longitudinal direction A3, and the arrangement direction A0 and the longitudinal direction A3 coincide with the arrangement direction of the predetermined number of cylinders C in the cylinder block 1.

Each upstream pipe wall 43 has an air funnel portion 43a that forms an inlet 50i. The upstream end passage 53 has an air funnel passage 53a as an inlet passage formed by an air funnel portion 43a that curves and expands toward the upstream side or toward the second side wall 25 in the first direction A1. In the air funnel passage 53a, the passage area continuously increases toward the upstream.
As shown in FIG. 4, each of the inlets 50i is substantially at the same position as the intake air introduction passage 31 in the vertical direction A2, and the first intake passage 31 is located near the second side wall 25 in the first direction A1. It is located closer to the first side wall 24 in one direction A1.

  1 to 4, the second side wall 25 has an inclined wall 28 between the first end wall 22 and the second end wall 23 in the arrangement direction A0. The inclined wall 28 is inclined in the first direction A1 toward the inlet 50i facing the inclined wall 28 as it goes from the first end wall 22 to the second end wall 23 in the arrangement direction A0. The inclined wall 28 is slightly curved in a convex shape in the first direction A1 in the direction opposite to the first side wall 24, but may be substantially linear. For this reason, the intake air flowing in the expansion chamber 32 from the first end wall 22 toward the second end wall 23 in the arrangement direction A0 generates a velocity component toward each inlet 50i in the first direction A1 due to the inclined wall 28. Is deflected as follows.

3 and 4, the formation range S (see FIG. 3) of the inclined walls 28 in the arrangement direction A0 is the second most in the arrangement direction A0 among the predetermined number of inlets 50i in the arrangement direction A0. The inlet 50i of one or more specific number of intake branch passages 50 including at least the inlet 50iB of one intake branch passage 50B near the end wall 23 is substantially equal to or wider than the range of arrangement in the arrangement direction A0. Is set.
In this embodiment, since the specific number is equal to the predetermined number, the formation range S is substantially equal to the range in which all the inlets 50i are arranged, and all the inlets 50i are opposed to the inclined wall 28 in the first direction A1. It is in the position to do.
In another example, the specific number is arranged in order from the second end wall 23 in the arrangement direction A0 and may be a plurality less than the predetermined number, or closest to the second end wall 23. It may be 1 only at the entrance 50iB.

In FIG. 4, the cross section of the first portion 28 a of the inclined wall 28 at the boundary of the formation range S near the first end wall 22 is indicated by a broken line, and at the boundary of the formation range S near the second end wall 23. The cross section of the second portion 28b of the inclined wall 28 is indicated by a two-dot chain line.
The index indicating the degree of inclination of the inclined wall 28 is the degree of proximity that the inclined wall 28 is close to each inlet 50i with respect to the intake introduction passage 31 in the first direction A1, and the inclination wall with respect to the intake introduction passage 31 in the first direction A1. 28 maximum proximity positions. The degree of proximity is determined by the amount of change in the first direction A1 between the portions 28a and 28b. The degree of proximity is a majority of the passage diameter d of the intake air introduction passage 31 in the first direction A1, and is preferably approximately equal to or greater than the passage diameter d. The maximum proximity position is determined by the position in the first direction A1 of the second portion 28b with respect to the intake air introduction passage 31.
In this embodiment, the degree of proximity of the intake air introduction passage 31 with respect to the inlet 50i is substantially equal to the passage diameter d of the inlet 50i, and the maximum proximity position is greater than each of the inlets 50i than the whole of the inlets 50i in the first direction A1. Therefore, the intake air in the expansion chamber 32 can efficiently flow into the inlet 50i near the second end wall 23 in the arrangement direction A0.

  2 to 5, the resonator 60 includes a resonator chamber wall 61 that forms a resonator chamber 62 disposed outside the expansion chamber 32 with the inclined wall 28 and the bottom wall 26 of the second side wall 25 as partition walls. And one or more communication passages for communicating the resonator chamber 62 with the expansion chamber 32, in this embodiment, two first and second communication passages forming a plurality of first and second communication passages 71 and 72, respectively. Pipes 66 and 67, and an on-off valve 80 that is disposed in one communication path 72 and opens and closes the communication path 72 in accordance with the engine speed as the engine operating state of the internal combustion engine E is provided. The communication pipes 66 and 67, which are separate members from the resonator chamber wall 61, are both connected to the inclined wall 28 by bolts 68 and 69, and the communication pipe 66 and 67 is connected to the inclined wall 28. A first communication pipe 66 that is a pipe is attached to the bottom wall 26.

The resonator chamber wall 61 includes a lower chamber wall 61a as a first chamber wall integrally formed with the collecting chamber wall 21 and an upper chamber wall 61b as a second chamber wall. Both chamber walls 61a and 61b are connected by bolts. The inclined wall 28 and the bottom wall 26 constitute a part of the upper chamber wall 61b.
The resonator chamber 62 includes a lower chamber 62a as a first chamber positioned directly below the expansion chamber 32 with the bottom wall 26 sandwiched in the up-down direction A2, and a right side of the expansion chamber 32 with the inclined wall 28 sandwiched in the first direction A1. And an upper chamber 62b as a second chamber. The resonator chamber 62 is arranged using a space created outside the expansion chamber 32 in the up-down direction A2 and a space created outside the expansion chamber 32 in the first direction. The resonator chamber 62 has an L-shaped space when viewed from the arrangement direction A0 by the lower chamber 62a adjacent to the expansion chamber 32 in the vertical direction A2 and the upper chamber 62b adjacent to the expansion chamber 32 in the first direction A1. It has become.

  The first communication passage 71 disposed in the bottom wall 26 has a first collecting chamber side communication port 71a and a first resonator chamber side communication port 71b that opens to the lower chamber 62a, and is disposed on the inclined wall 28. The second communication path 72 includes a second collecting chamber side communication port 72a and a second resonator chamber side communication port 72b that opens to the upper chamber 62b. The first communication path 71 is an always-communication type communication path that always communicates with the expansion chamber 32, and the second communication path 72 is a communication with an opening / closing valve provided with an opening / closing valve 80 that is opened / closed according to the engine operating state. It is a passage. The first communication passage 71 has a passage area smaller than the passage area of the second communication passage 72, and the first communication passage 71 is longer than the passage length of the second communication passage 72 which is a communication passage for high-speed rotation. This is a communication passage for low-speed rotation having a passage length.

The first communication path 71 is positioned closer to the inclined wall 28 of the second side wall 25 than the respective inlets 50i in the first direction A1, and is positioned between the respective inlets 50i and the intake air introduction path 31 in the first direction A1. At the same time, it extends in a straight line substantially parallel to the vertical direction A2.
The second communication passage 72 that extends linearly in a direction substantially perpendicular to the inclined wall 28 is provided with an on-off valve 80 constituted by a butterfly valve having a disc-like valve body 81 and a valve shaft 82. The on-off valve 80 is driven by an actuator 85 controlled by a control device, and rotates about a rotation center line L defined by the valve shaft 82 to be in a fully closed state and a fully open state as a valve open state. Be controlled.
When the on-off valve 80 is in the fully closed state, the valve body 81 is accommodated in the communication path 72 and does not protrude into the expansion chamber 32, and further, along the inclined wall 28 in the communication path 72, that is, The inclined wall 28 is disposed substantially in parallel.

  The valve shaft 82 and the rotation center line L are substantially parallel to the arrangement direction A0 when viewed from the first direction A1, or substantially parallel to a plane parallel to the arrangement direction A0 and the first direction A1, and to the inclined wall 28. Extending along. In the expansion chamber 32, the on-off valve 80 protrudes from the communication passage 72 into the expansion chamber 32 in the open state in order to suppress the turbulence of the intake air flow caused by the on-off valve 80 in the fully open state. The valve body 81 is arranged so as to be substantially parallel to the arrangement direction A0, and thus to be substantially parallel to the flow of the intake air in the expansion chamber 32.

  When the on / off valve 80 is fully closed and the second communication path 72 is closed, and the resonator chamber 62 and the expansion chamber 32 are not in communication, the first communication path 71 and the resonator chamber 62 In the first resonance operation region in the first engine rotation speed region of the internal combustion engine E, resonance occurs, and volume efficiency is improved by resonance supercharging. When the engine speed of the internal combustion engine E is in the second resonance operation region, which is the second engine rotation speed region that is higher than the first engine rotation speed region, the on-off valve 80 is fully opened and the second communication passage 72 is passed through. The expansion room 32 and the resonator room 62 communicate with each other. At this time, resonance is generated by the first and second communication passages 71 and 72 and the resonator chamber 62, and volumetric efficiency is improved by resonance supercharging. The on-off valve 80 is opened only in the second engine rotation speed region and is fully opened, and is fully closed in engine rotation speed regions other than the second engine rotation speed region.

  As shown in FIG. 3, the second communication port 72a is located farther from the intake air introduction passage 31 than the first communication port 71a in the arrangement direction A0. Therefore, the first communication port 71a is more distant from the second communication port 72a. Is far from the second end wall 23. As a result, the intake air deflected against the second end wall 23 is in communication with the resonator chamber 62 in the non-resonant operation region, in the vicinity of the maximum output operation region where the intake air amount is large and the engine rotational speed is high. Since the flow from the first communication path to the resonator chamber 62 is suppressed, the occurrence of intake air turbulence caused by the first communication port 71a is suppressed, which contributes to an improvement in volume efficiency.

Next, operations and effects of the embodiment configured as described above will be described.
A predetermined number of intake branch passages 50 communicating the intake air collecting chamber 30 having the intake air introduction passage 31 into which the intake air flows and the combustion spaces 3 respectively formed by the predetermined number of cylinders C, and the intake air collecting chamber 30 In the intake device 10 of the multi-cylinder internal combustion engine E provided with the resonator chamber 62 that communicates with the communication passages 71 and 72, each intake branch passage 50 has an inlet 50i that opens to the intake manifold 30, and each inlet 50i Is formed by the upstream pipe wall 43 of the passage wall 42 that forms each intake branch passage 50, and the predetermined number of inlets 50i are arranged side by side in the arrangement direction A0, and the collecting chamber wall 21 that forms the intake collecting chamber 30 Includes a first end wall 22 and a second end wall 23 facing each other in the arrangement direction A0, and a first side wall 24 and a second side wall 25 facing each other in the first direction A1 on the orthogonal plane P orthogonal to the arrangement direction A0. The first end wall 22 forms an intake air introduction passage 31, and is formed in the first side wall 24. An upstream pipe wall 43 is disposed, and the main flow of the intake air flowing in from the intake introduction passage 31 flows in the arrangement direction A0 from the first end wall 22 toward the second end wall 23 in the intake air collecting chamber 30, and the second The side wall 25 has an inclined wall 28 between the first end wall 22 and the second end wall 23 in the arrangement direction A0, and the inclined wall 28 extends from the first end wall 22 to the second end wall in the arrangement direction A0. 23, it is inclined in a direction approaching the inlet 50i facing the inclined wall 28 in the first direction A1, and the inclined wall 28 constitutes the chamber wall 61 of the resonator chamber 62 in the first direction A1, The two communicating passages 72 are disposed on the inclined wall 28, and an opening / closing valve 80 for opening and closing the communicating passage 72 is disposed in the communicating passage 72. With this structure, the intake air flowing from the intake air introduction passage 31 and flowing in the expansion chamber 32 from the first end wall 22 toward the second end wall 23 in the arrangement direction A0 is prevented from diffusing by the inclined wall 28. In addition, since the velocity component is deflected so as to generate a velocity component toward the inlet 50i of the intake branch passage 50 in the first direction A1, the intake branch passage 50B far from the intake introduction passage 31 in the arrangement direction A0 is also separated from the intake manifold 30. The intake air amount of the intake air flowing in increases, and the intake air amount between the predetermined number of intake branch passages 50 is equalized. As a result, the variation in the combustion state between the combustion spaces 3 formed by the predetermined number of cylinders C is reduced, the exhaust emission performance is improved, and the torque fluctuation is reduced.
Further, since the inclined wall 28 constitutes the resonator chamber wall 61 forming the resonator chamber 62, the inclined wall 28 is inclined so as to approach the inlet 50i of the intake branch passage 50 in the first direction A1. Since the resonator chamber 62 can be disposed by using the space created outside the inclined wall 28 in the direction A1, the resonator chamber 62 disposed adjacent to the expansion chamber 32 with the inclined wall 28 interposed therebetween is provided. The provided intake device 10 can be reduced in size.
Further, since the communication path 72 provided with the on-off valve 80 is disposed on the inclined wall 28 as a communication path for communicating the expansion chamber 32 and the resonator chamber 62, the on-off valve 80 is in the open state and the communication path 72 In an operation region different from the resonance operation region in which resonance occurs due to (ie, a non-resonance operation region), the communication path 72 can be closed by the on-off valve 80. Therefore, the occurrence of disturbance in the flow of the intake air flowing along the inclined wall 28 is suppressed as compared with the communication path that is always in communication, and the intake air between the predetermined number of intake branch passages 50 by the inclined wall 28 is suppressed. The operating area where the quantity is equalized is expanded.

  The on-off valve 80 is constituted by a butterfly valve that rotates about a rotation center line L. The rotation center line L is substantially parallel to the arrangement direction A0 and is inclined to the inclined wall 28 when viewed from the first direction A1. Since the valve body 81 of the on-off valve 80 constituted by a butterfly valve is substantially parallel to the flow direction of the intake air when the on-off valve 80 is in the fully open state, the open / close state is in the open state. Occurrence of the turbulence of the intake air due to the valve 80 is suppressed, and a decrease in the equalizing action of the intake air amount among the predetermined number of intake branch passages 50 by the inclined wall 28 is suppressed.

  When the direction perpendicular to the first direction A1 on the orthogonal plane P is the vertical direction A2, the assembly chamber wall 21 is opposed to the first side wall 24 and the second side wall 25 in the first direction A1 in the vertical direction A2. The resonator chamber 62 always communicates with the intake air collecting chamber 30 through a first communication path 71 that is a communication path different from the second communication path 72. The communication path 71 Arranged on the bottom wall 26. With this structure, in addition to the communication path 72 provided with the on-off valve 80, another communication path 71 that always connects the expansion chamber 32 and the resonator chamber 62 is provided, so that a resonance operation region in which resonance by the resonator 60 occurs is provided. Enlarged. Further, since the communication passage 71 is disposed on the bottom wall 26 of the collecting chamber wall 21 that forms the expansion chamber 32 of the intake collecting chamber 30, the communication passage 71 allows the intake air flowing along the inclined wall 28 to flow. Disturbance is prevented from occurring, and equalization of the intake air amount among the predetermined number of intake branch passages 50 by the inclined wall 28 is maintained.

  The resonator chamber 62 includes a lower chamber 62a positioned directly below the expansion chamber 32 with the bottom wall 26 sandwiched in the vertical direction A2, and an upper chamber 32b positioned directly beside the expansion chamber 32 with the inclined wall 28 sandwiched in the first direction A1. Therefore, the lower chamber 62a is located directly below the bottom wall 26 where the communication passage 71 for always connecting the expansion chamber 32 and the resonator chamber 62 is disposed. It becomes easy to communicate with the chamber 62. As a result, the degree of freedom in setting the passage length and the passage area of the communication passage 71 is increased, and the degree of freedom in setting the resonance operation region is increased.

Hereinafter, a mode in which a part of the above-described embodiment is changed will be described focusing on the changed portion.
There may be a plurality of intake branch passages communicating with at least one combustion space 3 of the predetermined number of combustion spaces 3. In this case, at least the predetermined number of intake branch passages are provided in the internal combustion engine. Will be provided.
A multi-cylinder internal combustion engine is an internal combustion engine that does not include a throttle valve that controls the intake air amount over the entire operation region, such as a diesel engine or an intake valve whose lift amount is controlled according to the engine operating state. It may be a spark ignition internal combustion engine in which the intake air amount is controlled.
Although the internal combustion engine is used for a vehicle in the embodiment, it may be used for a ship propulsion device such as an outboard motor having a crankshaft oriented in the vertical direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a multi-cylinder internal combustion engine including an intake device to which the present invention is applied, as viewed from above and below. It is the II-II sectional view taken on the line of FIG. 1, and it is the figure seen from the 1st direction. It is the III-III sectional view taken on the line of FIG. 2, and is the figure seen from the up-down direction. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, and is a view of a cross section taken along a plane orthogonal to the arrangement direction as viewed from the arrangement direction. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4 and is a view seen from a first direction.

Explanation of symbols

10 ... intake device, 21 ... collecting chamber wall, 22, 23 ... end wall, 24, 25 ... side wall, 26 ... bottom wall, 28 ... inclined wall, 30 ... intake collecting chamber, 32 ... expansion chamber 32, 42 ... passage wall 43 ... Upstream pipe wall, 50 ... Intake branch passage, 60 ... Resonator, 61 ... Resonator chamber wall, 62 ... Resonator chamber, 62a ... Lower chamber, 62b ... Upper chamber, 71,72 ... Communication passage, 80 ... Open / close valve ,
E ... multi-cylinder internal combustion engine, C ... cylinder, A0 ... arrangement direction, A1 ... first direction, A2 ... vertical direction, S ... formation range, L ... rotation center line.

Claims (3)

An intake air collection chamber (30) having an intake air introduction passage (31) through which intake air flows, the predetermined number of combustion spaces (3) formed in a plurality of predetermined number of cylinders (C), and the intake air collection chamber And a predetermined number of intake branch passages (50) that communicate with each other (30), and a resonator chamber (62) that communicates with the intake manifold (30) through the communication passages (71, 72). In an intake device for an internal combustion engine,
Each intake branch passage (50) has an inlet (50i) that opens to the intake manifold (30);
Each inlet (50i) is formed by an upstream end passage wall (43) of a passage wall (42) forming each intake branch passage (50),
The predetermined number of the inlets (50i) are arranged side by side in the arrangement direction (A0),
The collecting chamber wall (21) forming the intake collecting chamber (30) has a first end wall (22) and a second end wall (23) facing each other in the arrangement direction (A0), and the arrangement direction (A0). A first side wall (24) and a second side wall (25) facing each other in a first direction (A1) on an orthogonal plane (P) orthogonal to
The first end wall (22) forms the intake introduction passage (31),
On the first side wall (24), the upstream end passage wall (43) is disposed,
The main flow of the intake air flowing in from the intake air introduction passage (31) is the arrangement direction (A0) from the first end wall (22) toward the second end wall (23) in the intake air collecting chamber (30). )
The second side wall (25) has an inclined wall (28) between the first end wall (22) and the second end wall (23) in the arrangement direction (A0),
The inclined wall (28) extends in the first direction (A1) from the first end wall (22) toward the second end wall (23) in the arrangement direction (A0). Is inclined in a direction approaching the entrance (50i) facing
The inclined wall (28) constitutes a chamber wall (61) of the resonator chamber (62) in the first direction (A1),
The communication path (72) is disposed in the inclined wall (28),
The communication path (72) is provided with an on-off valve (80) for opening and closing the communication path (72) .
The on-off valve (80) is constituted by a butterfly valve that rotates about a rotation center line (L),
The intake device for a multi-cylinder internal combustion engine , wherein the rotation center line (L) is substantially parallel to the arrangement direction (A0) when viewed from the first direction (A1) . When the direction perpendicular to the first direction (A1) on the orthogonal plane (P) is the vertical direction (A2), the assembly chamber wall (21) is the first side wall in the first direction (A1). (24) and the second side wall (25) between the bottom wall (26) and the ceiling wall (27) facing in the vertical direction (A2),
The resonator chamber (62) always communicates with the intake air collecting chamber (30) through a communication passage (71) different from the communication passage (72).
It said further communication path (71), an intake device for a multi-cylinder internal combustion engine according to claim 1, characterized in that disposed in the bottom wall (26). The resonator chamber (62) includes a first chamber (62a) positioned directly below the intake air collecting chamber (30) across the bottom wall (26) in the vertical direction (A2), and the first direction (A1). And a second chamber (62b) positioned directly beside the intake air collecting chamber (30) with the inclined wall (28) interposed therebetween. 3. An intake system for a multi-cylinder internal combustion engine according to claim 2, further comprising:

Images